H3C
Exam Name: Constructing Enterprise-level Routing Networks
Exam code: GB0-283
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Question:
1.
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The multicast address used
by OSPF is ( ).
A. 224.0.0.5
B. 224.0.0.6
C. 224.0.0.9
D. 224.0.0.10
Answer: A,B
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Question:
2.
|
Which of the following
descriptions about route aggregation in OSPF is/are wrong? ( )
A. The ABR can
automatically summarize routes without manual configuration.
B. Aggregation can be made
only on the ABR.
C. The router serving as
the ABR and the ASBR concurrently cannot summarize routes.
D. The ASBR can summarize
all external routes.
Answer: A,B,C,D
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Question:
3.
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The ASBR imports four
external routes, 192.168.0.0/24, 192.168.1.0/24, 192.168.2.0/24 and
192.168.3.0/24. These routes are aggregated to one route 192.168.0.0/22 by the
ABR. Which routes will the ABR redistribute to the other areas? ( )
A. One aggregation route
B. The four original
routes
C. One aggregation route
and the four original routes
D. None
Answer: B
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Question:
4.
|
Which of the following
descriptions about the IPSec Security Association (SA) is/are correct? ( )
A. The data security
service provided by IPSec is realized through SAs.
B. One SA is a
unidirectional logical connection between two IPSec peers.
C. The inbound data flow
and outbound data flow are respectively processed by the inbound SA and
outbound SA
D. SAs can be set up by
the means of manual configuration or automatic negotiation.
Answer: A,B,C,D
|
Question:
5.
|
CAR is realized at the IP
layer so that it can only limit the traffic of IP packets. Compared with CAR,
LR can limit all the traffic passing through the physical interface.
A. True
B. False
Answer: A
|
Question:
6.
|
Which of the following
descriptions about QoS at the access, convergence and core layers is/are
correct?
( )
A. QoS is implemented
identically in the access, convergence and core layers.
B. Packets are classified
and marked in the access layer.
C. No QoS mechanism should
be configured in the access layer.
D. Usually, the queuing
mechanism (such as CBQ) and the congestion avoidance mechanism (such as WRED)
should be used in the convergence layer.
Answer: B,D
|
Question:
7.
|
Which of the following
descriptions about queue is correct? ( )
A. WFQ discarding
mechanism is Tail Drop on each queue, the same as CQ.
B. WFQ classifies data
flow by using ACL.
C. CBWFQ is an improvement
of WFQ using the same basic scheduling as WFQ.
D. LLQ will first check
the low-latency queue and take packets from the queue. Only when there is no
packet in the low-delay queue, it will take the packets from other queues. In
addition, it uses other mechanisms to avoid starving to death of the queues.
Answer: D
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Question:
8.
|
Compared with IPv4, the
IPv6 address is extended to ( ).
A. 128 bits
B. 164 bits
C. 64 bits
D. 256 bits
Answer: A
|
Question:
9.
|
As shown in the figure,
Area 1 is an NSSA area and RouterD is the ABR of the area. The configuration on
RouterD is as follows:
ospf 1
area 0.0.0.1
network 10.45.0.0
0.0.0.255
nssa
default-route-advertise
#
area 0.0.0.0
network 4.4.4.4 0.0.0.0
network 10.34.0.0
0.0.0.255
Which of the following
descriptions about the above network diagram and configuration is correct? ( )
A. RouterD redistributes a
Type 7 LSA for a default route in Area 1. RouterE and RouterF can receive this
LSA
B. RouterD redistributes a
Type 5 LSA for a default route in Area 1. RouterE and RouterF can receive this
LSA
C. RouterC can receive a
Type 5 LSA for a default route redistributed by RouterD.
D. None of the above
Answer: A
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Question:
10.
|
Which of the following
descriptions about OSPF STUB area is wrong? ( )
A. A backbone area cannot
be configured as STUB area and a virtual link cannot pass through a STUB area.
B. It is unnecessary to
configure this attribute on all routers in a STUB area.
C. There is no ASBR in a
STUB area.
D. After an area is
configured as STUB area, the Type 3 LSA of other areas can be propagated in
this area.
Answer: B
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